Spear



C. HART March 1, 1927.

SPEAR 2 Sheets-Sheet 1 Filed Abril l, 1926 v'MmhY 1, 1927.

lC.,HART,

- sPsAR Filed April 1, 1926 Y zvshestsgsneetz Y f f A l v8 //O l v L12, q I

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e I. 4 Il E v gwuwntoz .2 @211g NM1 a @fw 51M n" is screwed onto it and the upper end of this patented, Mar.v k1, 1927.

fotYnr. naar, or HU'MBLE, rain/is, assronen'or' cnn-HALF lfro .Toi-1N e; CARR, or

` HAnnis ooUNTY, Texas.

' SPEAR.

Application fue@ April 1, 192e. serial. No. 99,122.

ing pipe engaging jaws and aineehanism` operable by iuid pressure through which said jaws may be .act-uated. into engagement with-they pipe; said spear also embodying means for Vnormally holding said-jaws out of. engagementwith said pipe,

1Withihe,above and other objects V1n view this invention-has particular relation to cer.- tain novel features of construction, operationand arrangement of parts, an example of Vwhich is given in this speciiication and illustrated in the accompanying drawings,`

wherein Figure 1 shows a vertical sectional view ofthe device.

Figure 2 shows a cross sectional view taken on the line 2 2 of Figure 1.

Figure 3 shows .a cross sectional view taken on the line 3-3'of Figure 1.

Figure 4 shows a vertical sectional view of another formof the spear.

Figure 5 shows a cross sectional view taken on the line 5-5 0f Figure 4, and

Figure 6 shows a cross sectional view taken on the line 6 6 of Figure 4.

Referring now more particularly to the drawings, wherein like numerals of referlenc-e designate similar parts in each of the figures, the numeral 1 designates a .downwardly flared mandrel whose lower end is tapered and carries a guide point 2. This guide point not only servesto guide the spear into the pipe to be pulled', but also serves as a bit to remove any earth. or clogging material that may be in said pipe. The downwardly flared surface of the mandrel 1 has the grooves or tracks 3, in which the jaws 4 are mounted to sli-de. The outer surfaces of these jaws areserrated, forming teeth, which engage the pipe to be pulled.

The upper end of the mandrel is reduced and outwardly threaded yand the cylinder 5 cylinder is connected to the string of pipe 6, through the coupling 7 In the cylinder at i fthere is a plunger S whose upward- Vmovef y ment is limited by the.L annular stop .91 securedwithin the coupling, 7.'

, Depending from theplunger there Yis an actuating. `rod indicated by. the numerals 10,10 in Figuresl and.4 respeetively, The lower ends of these rods workin thesocket 1l inthe mandrel 1. Surroundingfeach rod 10, 10l there is a coil'spring 12v which, rests on the corresponding mandrel` whose upper endsupports the plunger S.

Thelower end `ofthe rod 10 is connected to the Vcorresponding Vjaws 4: through` the links 13, whichy worlr through, slots 14,. in

the mandrel and. whose ends are` pivoted kto the -rod 10 and to the respeetwe jaws 4.

The lower end' of the r od 1() is taper ing and works ,between the' upper endsof the links,13x which workthrough the slots 14?V in 'theY corresponding mandrel and, whose outer ends.` are plvOt-edjto the corresponding jaws-.4.. 'The links, 13. move lengthwise ithrough their slots 14i. and are retained ther-ein bymean-s of .pintlesf 1.5,. which. are

t'ted; through theJengt-liww slets.. 16. .in the links 137.` The jaws 4, in the form shown in Figures 4 to 6 are seated on the coil springs 18, as shown.

In order to engage the spear with the pipe toV be pulled itis let down into the pipe and pump pressure is then applied to the fiuid in the string 6 and this will force the plunger 8 downwardly and operate through the rod 10 and links 13, or through the rod 10 and the links 13', as the case may be to force the corresponding jaws 4 downwardly and outwardly into engagement with the pipe to be pulled. The upper part of the cylinder 5 has reliefports 17 to relieve the pressure after the spear is engaged with said pipe. An upward pull may now be exerted throughl the string 6 and the stuck pipe may be thus dislodged.

1f the pipe cannot be recovered the pump pressure is cut off and the spear suddenly forced downwardly and this will operate to release the jaws 4 from the pipe and the spring 12, shown in Figure 1, or the springs 16, shown in Figure 4, will then immediately carry said jaws up into released position and the spear may then be removed.

That I claim is z- 1. A spear including a mandrel having a downwardly iiared portion provided with tracks, pipe engaging jaws mounted to slide los.

on said tracks and whose outer sides are formed with teeth, said mandrel having a deep socket therein forming a bearing, a cylinder associated with the mandre a plunger in the cylinder, a stop carried by the cylinder adapted to limit the upward movement of said plunger, an actuating rod carried by the plunger and working in said socket, a coil spring surrounding said rod and interposed between the upper end or the `mandrel and the plunger,said mandrel having downwardly diverging slots leading from said socket through said mandrel, links working through said slots and pivoted at their' lower ends to the corresponding jaws and whose upper ends are in operative connection with said rod, each link hav ing a. lengthwise slot therethrough forming a bearing and a pintle fixed to said mandrel and working through said bearing.

2. A spear including a mandrel having a downwardly flared portion provided with tracks, said mandrel also having an axial socket and slots diverging downwardly from said socket, jaws mounted to slide on said tracks, links pivoted at their lower ends to said jaws `and working through said slots, a. cylinder carried by the mandrel, a plunger therein, a rod carried by the plunger and adapted to work in said socket and oper tively connected with said links, a coil spring around said rod and interposed between t-he mandrel and plunger. y

3. A spear including a mandrel having a downwardly flared portion provided with tracks, said mandrel also having an axial socket and slots diverging downwardly from said socket, jaws mounted to slide on said tracks, links pivoted at their lower ends to said jaws and working through said slots, a cylinder carried by the mandrel, a plunger therein, a rod carried by the plunger and adapted to work in said socket and operatively connected with said links, a coil spring around said rod and interposed between the mandrel and plunger and a stop in the cylinder disposed to limit the range of movement of the plunger.

fl. A spear including a mandrel having a downwardly llared portion provided with tracks, said mandrel also having an axial socket and slots diverging downwardly from said socket, jaws mounted to slide on said tracks, links pivoted at their lower ends to said jaws and working through said slots, a cylinder carried by the mandrel, an actuating rod connected to the plunger and adapted to work iu said socket, and operatively connected with said links, a coil spring around said rod and interposed between the mandrel and plunger' and a stop in the cylinder adapted to limit the range of movenient of the plunger and a coil spring interposed between each jaw and the mandrel and operating against said jaw and tending to move the jaw in one direction relative to the mandrel. i

In testimony whereof I have signed my name to this speciiication.

CLYDE HART.

H i hnxvhj vvl'lifiwl Limi, thu lmlm' uf' lh() :xssig'lnw in Ihlalum mlmwi'lwl pnlvnt wus r\i'!murnx. l written and ln'hltvd :is 1)ulm (l. (`\:|l'|." wlwuzw szli name should have been written and printed as flo/m l). Narr, :is shown by the record of assignments in this office; and that the said Letters Pau-nt shnuld be rend with this correction therein that the same may conform to the reum'rl of the use in the Patent Office.

Signed and Scaled this 39th day 0f March, A. D. 1927.

[SEAL] M. .L ARMEE, 

